Apparatus in a lifting device for reducing error in weight measurements
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 15, 2001
Grant Date -
N/A
app pub date -
Jul 12, 1999
filing date -
Jul 12, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for lifting a load includes a carriage supported by one end of a chain. The chain passes over a sprocket wheel (mast roller) atop a hydraulically operated telescoping element and is anchored at a second end. In a first embodiment of the invention, an equalizing scheme for reducing errors in measuring the weight of the load includes providing a chain and sprocket-wheel having dimensions such that the rollers comprising each link of the chain span a predetermined portion of the circumference of the sprocket-wheel. In a second embodiment of the invention, the equalizing scheme includes a force sensor coupled to sense a force in connection with movement of the load thus generating a series of force measurements, the measurements being proportional to the weight of the load. The measurements are taken over a predetermined rotational movement of the sprocket-wheel and averaged to produce a value that is an accurate reflection of the weight of the load.
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